Liner for wood-pulp digesters.



G. E. MILLER.

LINER PoR Woon PULP DIGBSTBRS.

APPLICATION FILED JAN. 15.1914.

Patented Sept. 1, 1914.

QCA-

@vH/www0 GEORGE RNEST MILLER, OFYMADISON, MAINE.

LINER FR WOOD-PULP DIGESTER'S.'

T all whom t may concern.'

Be it known that I, GEORGE E. MILLER, a citizen of the United States. residing at Madison, in the county of Somerset and State of Maine, have invented certain newl and useful Improvements in Liners for Vood-Pulp Digesters; and I dodeclare the following to be a full, clear, and exact de-A scription of the invention, such as will enable others skilled in the art to which it appertains to make and use the same.

My invention relates primarily to digesters for cooking wood or other material used for makin pulp, but more especially to the lining of t e same. v

One object of my invention is to provide an acid-proof lining for this class of digesters, having integrally formed acid-proof pipe supports whereby the steam pipes or coils of the digester may be securely supported on the inner sides of the latter,.the supporting means being unaffected by the acids used in the process of digestion.

Another object of the same is to-Iprovide a lining of this class which is inexpensive, easily constructed and that can be readily replaced when worn.

With these and other objects in View my invention consists of ,certain novel features of construction and combination and arrangement of parts which will hereinafter be more particularly pointed out and claimed. y

In the accompanying drawings in which similar parts 'are designated by like characters Figure 1 is a transverse vertical section of an ordinary annular wood pulp digester, illustrating my improved linlng and pipe support interiorly arranged on opposite sides thereof, some of the pipe supporting members being here shown in section and 4others partly in section; Fig. 2 is a side elevation of one of my improved liner and pipe supports illustrating the bead receiving channel formed therein; Fig. 3 is a front elevation showing the curved pipe supporting projection formed on the face of the liner; Fig. 4 is a plan View illustrating the locking bead carried by my improved liner and support.

Ileretofore it has been customary in this particular art to support the steam pipes passing through the digester on the sides of the latter by means of bronze'plates, but usage has disclosed the fact that these plates soon become corroded and finally destroyed Specieation of Letters Patent.

'Patented sept. 1,1914.

Appncaaog inea January 15,1914. serial 110,812,302.

owing to the destructive effect@ of the acid used in the process, permitting the pipes to become `displaced and fall' into the bottom of the digester, with the result that a good deal of steam escapes` into the pulp damag-y ing the. quality of the same Aand much time 1s lost 1n replacing and repairing the coils,` all of which means a great loss of production. And it is to overcome these objectionable 'features that I Apropose to line the digester with acid-proof members having integrally formed hooks which retain the' pipes in place.

Referring more particularly to the drawings, 1 denotes the cylindrical metallic casing of an ordinary digester, although I do not limit myself to this particular form of the same. Formed around the inner surface of the casing 1 is the usual brick lining 2 which protects the casing-against the destructive action of the acids used in preparing the wood pulp.

Over a portion ofthe brick lining 2, on each side of the digester as clearly shown in Fig. 1 I propose to place my improved lining the individual members 3' of which consists of the acid-proof base 4. Formed on the upper surface of the latter are the longitudinally extending hook-shaped projections 5, the curved surface of which coacts ,with th'e upper surface of the base and with the adjacent member to form the concave shaped sockets 6 which latter makes a perfect receptacle for the-pipes used in digesting.

To properl retain the members' 3 in position within t e digester I provide two sides of the former with a centrally disposed and longitudinallyextending bead 7, while in the remaining sides I form a similarly disposed channel 8. yBy this arrangement it will be seen that when my improved lining has been placed in position, the bead 7 on one member will tit snugly within the channel 8 of the other, thus forming a tongue and groove connection for the same. 0f course, it will be understood that in some instances it may be desirable to cover the entire inner surface of the digester with my improved lining, in which case I would discontinue the use of the lining 2 and replace the same with my improved lining and pipe support cementing the tongue 7 within the groove 8 so4 as to prevent any of the acid tacking the metallic casing.

-prts for the steam pipes avoiding the ne cessity of metallic supports; thus makingit impossible for pipes to be displaced by reason of the destructive action of the acids used in the process. j

Various changes in theformlproportion,

and minor details of construction may be refrom the prin-v sorted to without departing h d t e a vantages ciple or sacrcing any o of the inventlon as-clalmed.-

What 1s claimed as new 1s:

A digestercomprising a metallic casingr I a plurality of acid-proomembers dis osed therein and constituting a lining there or, a

'longitudinally extending bead for-med on two sides of the latter, the remaining sides havin .therein a similarly extending channel w ereby when said members are placed in 4position 4the bead on one member will project into the channel of the adjacent.

member, hook-shaped Erojections extending longitudinally across t e u per face of -said members, said projections eing formed integral-with said members and composed of the same material'as the latter and adapted to coact therewith to form pipe supports.

, In testimony'\whereof I have hereunto set my hand' in presence of two subscribing witnesses. l

- GEORGE ERNEST MILLER.

Witnesses:

G. F. CHARLES, E. E Vosn. 

